This document discusses transistors as small signal amplifiers. It introduces amplifiers and their basic parameters including gain, input impedance, and output impedance. It describes how transistors can function as amplifiers and discusses analyzing amplifier circuits at low, middle, and high frequencies. It also mentions analyzing negative feedback topologies and performing AC analysis on amplifiers using theorems and simulation tools.

1. Chapter 1Transistor As A Small Signal AmplifierSEE 2253ELECTRONIC CIRCUITS

2. OutcomeCO1: Describe the basic laws and theorems of basic concept of amplifiers

3. CO2: Apply the basic laws, theorem and methods of analysis for solving various problems in electronic circuit

4. CO3: Analyze the procedure that should be taken in solving electric circuit using theorems and methods of analysis: Perform AC analysis on amplifiers at low, middle and high frequencies

5. CO4: Categorize and analyze negative feedback topologiesNorlaili Mat Safri, Ph.D

6. ContentsIntro to Amplifier Circuit

7. Basic Amplifier Circuit, Amplifier Parameters (Avoc, Av, Ai, Zi & Zo), Decibel (dB)

8. BJT as an amplifier

9. Mid freq. ac analysis using hybrid- model – CE, CC, CB

10. Frequency response: Analysis at low & high freq.

11. Short circuit current gain, Bode plot, Simulation using MultiSimNorlaili Mat Safri, Ph.D

12. Intro to Amplifier CircuitAmplifier is a system that can amplify weak electrical signal into strong one by increasing the power level of the weak input signal.

13. Amplifier can amplify current, voltage, and/or power.Norlaili Mat Safri, Ph.D

14. Intro to Amplifier CircuitConcept of small-signal amplifiersDC Supply VoltageAmplifierInput signalOutput signalViVoNorlaili Mat Safri, Ph.D

15. Intro to Amplifier CircuitFigure 1.1 : Examples of Amplifier Circuitry SystemNorlaili Mat Safri, Ph.D

16. Basic Amplifier ModelNorlaili Mat Safri, Ph.DFigure 1.2 : Amplifier Model

17. Intro to Amplifier Circuit Amplifier has 3 basic quantities (gain, A; input impedance, Zi, & output impedance, Zo).GainVoltage gain :

18. Current gain :

19. Power gain :Norlaili Mat Safri, Ph.D

20. Amplifier Parameters (Avoc, Av, Ai, Zi & Zo)Gain (A)Av & Ai: refer to previous slide.

21. AVOC? Zi? Zo?Norlaili Mat Safri, Ph.D

22. Decibel (dB)Gain (A), in dBAv (dB) = 20 log AvIf normalized,Av (dB) = 20 log (Av/Avmax)How about current gain (Ai) and power gain (Ap)?Norlaili Mat Safri, Ph.D

23. Basic Amplifier CircuitVoltage amplifierCurrent amplifierFigure 1.3 : Amplifier ModelNorlaili Mat Safri, Ph.D

24. Basic Amplifier CircuitTransconductance amplifierTransresistance amplifierFigure 1.3 : Amplifier Model…cont.Norlaili Mat Safri, Ph.D

25. Basic Amplifier CircuitQ. What is an amplifier?Q. What is an ideal amplifier?12Norlaili Mat Safri, Ph.D

26. Basic Amplifier ModelYour Answers to Attributes of an Ideal Amplifier,Norlaili Mat Safri, Ph.D

27. Basic Amplifier CircuitUnloaded voltage gainKeyword: Unloaded?Figure 1.4 : Basic amplifier model (unloaded)Norlaili Mat Safri, Ph.D

28. Basic Amplifier CircuitWith loading effectsKeyword: Loaded?Figure 1.5 : Basic amplifier model (loaded)Norlaili Mat Safri, Ph.D